# GEM eL XD Truck - Upgrades - Lithium, R4F Motor, On-Board Solar Charging, 72v to 110v Inverter, Lights **URL:** \ **Category:** GEM Forum\ **Created:** [April 20, 2019, 8:15pm UTC](https://community.electricforum.com/t/gem-el-xd-truck-upgrades-lithium-r4f-motor-on-board-solar-charging-72v-to-110v-inverter-lights/15895 "2019-04-20T20:15:45Z")\ **Posts on this page:** 1\ **Showing post:** 16
**Author:** ![GEMRIX](https://avatars.discourse-cdn.com/v4/letter/g/bbe5ce/32.png) [@GEMRIX](https://community.electricforum.com/u/GEMRIX)\ **Post date:** [April 22, 2019, 5:50am UTC](https://community.electricforum.com/t/gem-el-xd-truck-upgrades-lithium-r4f-motor-on-board-solar-charging-72v-to-110v-inverter-lights/15895/16 "2019-04-22T05:50:38Z")
**Here is an inverter under consideration** It is about $250 from China. There are some others on eBay and one for over 1k on Amazon. > **[100-149V 12-23V Car Power Inverters with DC/AC for sale | eBay](https://www.ebay.com/b/100-149V-12-23V-Car-Power-Inverters-with-DC-AC/58020/bn_73263016)** > > Get the best deals on 100-149V 12-23V Car Power Inverters with DC/AC when you shop the largest online selection at eBay.com. Free shipping on many items | Browse your favorite brands | affordable prices. **Product description** HuiKe pure sine wave inverters represent the most technologically advanced, lightweight, compact and diverse inverters on the market to help ensure the widest use of applications. For over a decade, the HuiKe ’ Power has consistently delivered the broadest range of sizes to accommodate virtually every power requirement. Advantages of a pure sine inverter: -Equipment runs more efficiently -Motors run cooler -Cleaner power -Ideal for power tool chargers, laser printers, electric shavers, microwaves, variable speed motors, TV’s, medical equipment. Intelligent LCD automatically detects faults and provides modification suggestions. Full Power, True Pure Sine Wave, No electromagnetic Interference About Description: inverter input: 12V/24V/48V/60V/72VDC DC input range: 10V-15V/21V-30V/42V-58V/50V-70V/70V-90V Inverter output:AC110+/-5% Output frequency: 60Hz Ouput waveform: Pure Sine Wave Continous power: 2500W PEAK power: 5000W Inverter Best efficiency: Aprox 92%~97.2% No Load Current Draw:less than 0.3 Low Voltage Alarm:10+/-0.5V, 20.5+/-1V, 44+/-1V, 55.5+/-1V, 62+/-3V Low Voltage Shut Down: 9.5+/-0.5V, 19.5+/-1V, 42+/-1V, 55.5+/-1V, 62+/-1V Over Voltage Shut Down:15.5V+/-0.5V Thermal shutdown: 60+ degrees Cooling Ways: Cooling Fan will run when the temperature is over 50 degree AC output: 2 BS socket Voltage input meter: yes Power out put meter: yes LCD display Over Thermal :Shut Off Output Automatically Fuses: Short Circuit Start:Soft Start Protection:Overload, Short Circuit, Overtemp, Reverse Polarity, Under/Over Voltage Machine Size(mm): 390_185_150MM Net Weight(kgs): 5.5kg aprox. * * * I found this online calculator to be useful. > **[Inverter AC to DC Amperage Conversion Calculator | Battery Stuff](https://www.batterystuff.com/kb/tools/ac-to-dc-amperage-conversion-run-through-an-inverter.html)** > > Learn how to convert AC amps to DC amps through an inverter with our amperage conversion calculator, from Battery Stuff! It does not have 72v but you can just use 36v & divide Amps DC by two. **Amperage** I am aiming to create a 20 Amp 110 VAC supply and slightly oversizing the inverter for headroom. ![20a](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/4/465b421a48bc87f19c87aab7655f0e44f011ac69.png) This is about 34 Amps DC (67.47 / 2 = 33.74). Is this unreasonable? Too much? For comparison, what does the motor draw through the controller? **Runtime** This is an example supplying 1,000 watts. How long will it last? ![1k](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/b/bb2a68b66930a97c645c294c241878f65ed0eee5.png) - 1,000 watts equates to 15.35 Amps DC @ 72v (even less amperage at 80v) - 160ah / 15.35 Amps = 10.42 hours theoretical max runtime - 10.42 X 0.80 = 8.33 hours assuming a safe 80% depth of discharge - 1,000 watts for 8 hours, 500 watts for 16 hours, and so on * * * **Please point out any flaws in the math.** I also found another thread about this idea with @Old_Houseboater @LA-GEM4s @Big_Dee @LithiumGods > [@GEM car as power source in Blackout?](https://community.electricforum.com/t/gem-car-as-power-source-in-blackout/12199): > > I’m a longtime reader - first time poster to the forum. Since buying my 2001 Gem 4 seater this month I’ve been thinking that it might also be a good source of power during a blackout (think earthquakes here in CA) Does anyone have a recommendation on hooking up an inverter to the 72 volt string? Would it be a direct hookup to the battery series, or simply plug into the cigarette lighter. Any thoughts on how to do this, and what brand/model inverter would be welcome. like this? Thank … --- _[View the full topic](https://community.electricforum.com/t/gem-el-xd-truck-upgrades-lithium-r4f-motor-on-board-solar-charging-72v-to-110v-inverter-lights/15895)._