![]() ![]() Large motors, especially starting a pump into pressure is where you have problems. Resistive loads like a hot plate and space heater are easy for an inverter, there is not surge. My 700 watt inverter is just able to start my 230 watt fridge. High frequency inverters are more like 150% surge, but only for a fraction of a second. Low frequency inverters can usually handle double surge power (200%) for a few seconds. Anything with a motor, expect it to need about 5 times the power to get started. Maybe invest in a Kill-O-Watt meter and see what they really draw. And a good sine wave unit would be better for the motor, it will make a lot less heat and be more efficient.īefore you spend a lot of money on a good inverter, do a little math on the loads you want to run. A 1,000 watt would probably do the job just fine. I have a cheapo 700 watt 12 volt modified sine inverter, and it will run my fridge, but barely. ![]() But if you have a device like a fridge or A/C with a compressor, and it needs a surge to start, that 4,000 watt inverter may be needed to do the job, even if your constant draw is only 300 watts. If you really did need 4,000 watts, that 200 amp hour 12 volt battery would not even run it for 30 minutes. How much power do you really need and for how long? ![]() I just got my Fortune cells in 30 minutes ago. Another guy boiled a bunch of water with a hot plate and power other things at the same time on 3000 watts on 24V, I would assume those draws are large. Would the surge draw enough current to go over the max amperage of the BMS? Otherwise I read most refrigerators run at 650 watts on average after the milliseconds long surge of the compressor motor starting.Īre there non-transistor inverters? Like my linear power supply for my ham radio gear?Īs for people claiming they are fine, I see one guy ran a 1500 watt space heat for 2 hours with no issue on 3000 watts 24 V. I'm basing this on Will's suggestions only.Īs for the case of a refrigerator, the surge seems to be the problem. I'm not sure what other BMS options are out there that are as good of quality as Overkill Solar that handle more amperage. So by quality you mean something like Victron? Are there other "quality" brands? I believe in the case of the Overkill Solar BMS that would be 127% of it's rated capacity since the BMS is 120 Amp. That means you won't notice a problem until it fails to protect your battery. The other thing about fet based bmss is the transistors have a habit of failing closed. The thing about fet based bmss is transistors are susceptible to heat stress. What evidence do you have that these folks are "doing fine"? There are very few components that I would run at 100% of spec. If you think that driving a bms to 147% of its rated capacity is a good idea then go for it.Īs I've said before I de-rate quality parts by. High quality low frequency inverters will be ~90 efficient as well but we do the math differently to account for their substantial surge capability. Higher quality high frequency inverters will be ~90% efficient. They get a little more efficient at 24 and 48 volts but not significantly. 85 conversion factor is a good efficiency for the low end high frequency inverters. 8 de-rate applies across across system voltages. Will's wiring offerings put 4000 watts in the 24 v category, so do I need to buy 24 V cables for my 12 V system? I know people who run high wattage inverters on 12 V just fine, but those same people tend to rig everything too, so I want to be realistic, but don't have to be perfect or absolute ideal best practice. I was going to go with a Giandel 400 watt inverter, but I thought I better check here first. I don't have a specific time requirement other than maybe a day at the most, but most like under 6 hours. Is there anything I need to look out for, like do I need large gauge wires, a special fuse size, more heat generation? I want to be able to power one of our three full sized refrigerators, router, modem, and a couple laptops and tablets if the power goes out in our home. I plan on building a 200 Ah battery pack using Fortune cells and was going to use a 4000 Watt inverter with it. Hey everyone, I know it's preferred to have anything over 2000 watts on a 24 v or 48 v system. ![]()
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