my inverter has two positive and two negative

higginsk

i bought a pure sine inverter for a o,55kw submisive pump. i want to connect but it has two positive and two negative on dc connection. rated 1500 w and peak power 3000 w. input 12dc output 220vac and 50hz frequency.

Photowhit

I've seen this before in inexpensive inverters, I suspect they are bonded/same input, but check your owners manual. With a 12 volt 1500 watt inverter, you will want very heavy wire from your battery bank, as too thin a wire will create a voltage drop and your inverter may shut down, 1500 watts at 12volts is (1500/12=) 125 amps! You will want your battery bank close to the inverter to shorten the wire runs as well. Also having too small a battery bank can create a problem as the battery capacity in amps is rated at a 20 hour discharge (normally) Higher discharge rates will effectively lower the available capacity.

mcgivor

Have seen an inverter with 2 sets of DC inputs, a 2000W 24V in this case, at a local store, looked to be 2×1Kw units stacked, not sure if this is the case with yours, do you have a make/model or some pictures? Dose it have 2 cooling fans ? The Cotek SK 2024 is a stacked unit for sure but has only one set of DC inputs and 2 fans, 1 for each individual inverter.

BB.

Some of the higher wattage 12 volt AC inverters use parallel positive and negative cables (instead of one larger cable). For example, the maximum current would be:

• 3,000 Watts * 1/0.85 ac inverter eff * 1/10.5 volts cutoff = 336 Amps maximum (~168 Amps at 1,500 watts continuous)

Generally the manual will tell you the recommended wiring size (AWG in US, and maximum length).

Download Brochure - Aberdare Cables

This seems to give some good information on cable capacity for South Africa:

Do you have a link to the inverter manual?

-Bill