{"product_id":"big-battery-nexus-apex-6-5k-off-grid-system","title":"Big Battery | NEXUS + APEX-6.5K Off-Grid System","description":"\u003ch2 data-end=\"66\" data-start=\"0\"\u003e\u003cstrong\u003eBig Battery | NEXUS and APEX-10K Off-Grid Solar Power System Nexus + APEX-6.5K Off-Grid Power System with 15 kWh Battery\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-end=\"683\" data-start=\"68\"\u003eThis all-in-one energy system pairs a robust APEX-6.5K hybrid inverter with the Nexus 15 kWh LiFePO₄ battery bank to deliver reliable split-phase 120\/240 V power for cabins, remote homes, and off-grid properties. Designed to accept both solar and generator inputs, the system provides clean pure sine-wave output and high-capacity performance for essential loads, appliances, and everyday energy demands. Rugged construction, installer-friendly wiring, and scalable configuration options make it a dependable solution for energy independence and resilient power infrastructure. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"703\" data-start=\"685\"\u003e\u003cstrong data-end=\"701\" data-start=\"685\"\u003eKEY FEATURES\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-end=\"1288\" data-start=\"704\"\u003e\n\u003cli data-end=\"805\" data-start=\"704\"\u003eintegrated APEX-6.5K inverter with 6.5 kW continuous output \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"902\" data-start=\"806\"\u003e120\/240 V split-phase power for full residential loads \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1004\" data-start=\"903\"\u003eNexus 15 kWh LiFePO₄ battery bank with high usable capacity \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1095\" data-start=\"1005\"\u003eaccepts both solar and generator charging inputs \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1185\" data-start=\"1096\"\u003epure sine-wave output for sensitive electronics \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1288\" data-start=\"1186\"\u003escalable configurations with multiple batteries or inverters \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0775\/1398\/2234\/files\/1_bec3176b-f7da-463f-b484-e51b5751cc6b.png?v=1769458164\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0775\/1398\/2234\/files\/2_9e88183d-15fe-498e-8ecb-9c06e3edf704.png?v=1769458182\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0775\/1398\/2234\/files\/3_5907d607-ad8c-4dd1-8e76-0e90430d661d.png?v=1769458203\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSection\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDocument Title\u003c\/td\u003e\n\u003ctd\u003eAPEX-6.5K \u0026amp; APEX 10K INVERTER SPECIFICATIONS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eBigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eAPEX-6.5K \/ APEX-10K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated Output Power\u003c\/td\u003e\n\u003ctd\u003eAPEX-6.5K: 6,500W \/ APEX-10K: 10,000W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax. Output Power\u003c\/td\u003e\n\u003ctd\u003eAPEX-6.5K: 13,000VA \/ APEX-10K: 20,000VA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated Output Voltage\u003c\/td\u003e\n\u003ctd\u003e120\/240 Vac (single-phase \/ split-phase)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLoad Capacity of Motors\u003c\/td\u003e\n\u003ctd\u003eAPEX-6.5K: 4 HP \/ APEX-10K: 6 HP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated Frequency\u003c\/td\u003e\n\u003ctd\u003e50\/60Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Wave\u003c\/td\u003e\n\u003ctd\u003ePure sine wave\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSwitching Time\u003c\/td\u003e\n\u003ctd\u003e10ms (typical value)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery Type\u003c\/td\u003e\n\u003ctd\u003eLithium-ion battery \/ lead-acid battery \/ user-defined battery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated Battery Voltage\u003c\/td\u003e\n\u003ctd\u003e48V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery Voltage Range\u003c\/td\u003e\n\u003ctd\u003e40–60Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax. Solar Charging Current\u003c\/td\u003e\n\u003ctd\u003eAPEX-6.5K: 140A \/ APEX-10K: 200A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax. Grid \/ Generator Charging Current\u003c\/td\u003e\n\u003ctd\u003eAPEX-6.5K: 80A \/ APEX-10K: 120A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax. Hybrid Charge Current\u003c\/td\u003e\n\u003ctd\u003eAPEX-6.5K: 140A \/ APEX-10K: 200A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of MPPTs\u003c\/td\u003e\n\u003ctd\u003e1 + 1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax. Solar Input Power\u003c\/td\u003e\n\u003ctd\u003eAPEX-6.5K: 5,000W + 5,000W \/ APEX-10K: 5,000W + 5,500W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax. Solar Input Current\u003c\/td\u003e\n\u003ctd\u003eAPEX-6.5K: 18A + 18A \/ APEX-10K: 22A + 22A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax. Open Circuit Voltage\u003c\/td\u003e\n\u003ctd\u003e550Vdc + 550Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPPT Voltage Range\u003c\/td\u003e\n\u003ctd\u003e125–450Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrid \/ Generator Input Voltage Range\u003c\/td\u003e\n\u003ctd\u003e65–140Vac\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrid \/ Generator Input Frequency Range\u003c\/td\u003e\n\u003ctd\u003e50\/60Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBypass Overload Current\u003c\/td\u003e\n\u003ctd\u003eAPEX-6.5K: 40A \/ APEX-10K: 63A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Inputs\u003c\/td\u003e\n\u003ctd\u003eAPEX-6.5K: 2 inputs (Grid \u0026amp; Generator) \/ APEX-10K: 1 input (Grid or Generator)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax. Efficiency\u003c\/td\u003e\n\u003ctd\u003e99.9%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPPT Tracking Efficiency\u003c\/td\u003e\n\u003ctd\u003eAPEX-6.5K: 93% \/ APEX-10K: 92%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallel Capacity\u003c\/td\u003e\n\u003ctd\u003eUp to 6 units (more than 3 units in parallel can form a three-phase output)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (W × H × D)\u003c\/td\u003e\n\u003ctd\u003eAPEX-6.5K: 25.51 × 16.14 × 5.51 in \/ APEX-10K: 28.46 × 17.64 × 5.91 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eAPEX-6.5K: 48 lbs \/ APEX-10K: 62 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection Degree\u003c\/td\u003e\n\u003ctd\u003eIP20 (indoor only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e14–131°F, derate above 113°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal Module (Optional)\u003c\/td\u003e\n\u003ctd\u003eWi-Fi \/ GPRS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eUL1741 \/ RoHS \/ EN61000-6-1 \/ EN61000-6-3 \/ FCC Part15 Class B \/ IEC62109-1 \/ IEC62109-2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNoise Level\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;60dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCooling Method\u003c\/td\u003e\n\u003ctd\u003eIntelligent fan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Interfaces\u003c\/td\u003e\n\u003ctd\u003eRS485 \/ CAN \/ USB \/ Dry contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntegrated Circuit Breaker\u003c\/td\u003e\n\u003ctd\u003eUtility \/ Load \/ Battery \/ PV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverload Protection Behavior\u003c\/td\u003e\n\u003ctd\u003eOutput restores after 3 minutes. After 5 overloads, output shuts down until restart. (102%–110% load): shutdown after 5 min. (110%–125% load): shutdown after 10 sec. (\u0026gt;125% load): shutdown after 5 sec.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection Features\u003c\/td\u003e\n\u003ctd\u003ePV input current limiting, PV over-voltage, PV night reverse current, AC input over\/under-voltage, battery over\/under-voltage, battery over-current, AC output short-circuit, heat sink over-temperature, inverter overload protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cstrong\u003eManual \u0026amp; Downloads\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/01\/Nexus-SpecSheet.pdf\"\u003e\u003cstrong\u003eBattery Spec Sheet\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2025\/12\/NEXUS-User-Manual1.2.3.pdf\"\u003e\u003cstrong\u003eBattery User Manual\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/01\/APEX-SpecSheet.pdf\"\u003e\u003cstrong\u003eInverter Spec Sheet\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/01\/BigBattery-Apex-6.5-User-Manual.docx.pdf\"\u003e\u003cstrong\u003eInverter User Manual\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Big Battery","offers":[{"title":"Default Title","offer_id":51630238826778,"sku":"K0191","price":4535.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0775\/1398\/2234\/files\/EG4-Nexus-APEX-6-5K-Off-Grid-Power-System-with-15-0.png?v=1769491995","url":"https:\/\/solarguyspro.com\/products\/big-battery-nexus-apex-6-5k-off-grid-system","provider":"Solar Guys Pro","version":"1.0","type":"link"}