Originally Posted by udfxrookie
I have a 1998 Ford E-150 with a stock 130 Amp Alternator
-Red Top Main Starting Battery
2xYellow Top Optima Batteries in parrallel
For stereo and amps:
from battery bank to 2 farad cap
1 x 1000w pioneer amps
1 x 500w pioneer amp
Proposal for Rooftop A/C:
from battery bank to 2000 watt inverter
A/C Specs: 115 v, Min Circuit Ampacity: 11, Max Circuit Ampacity: 15, 60 Hertz
Will the setup I have with the battery bank in place work?
Will it drain the ba-jesus out of the battery bank?
Should I put in a capacitor for the A/C (to cover surges, etc)?
What's the difference between Power Inverter and Power Converter?
I have a Whistler P1000AC 1000 Watt Continous/2000 Watt Peak
I can get
WFCO WF-9875 75 Amp Power Converter
whats the difference and which is better?
In general we are looking for your battery size also, Red Top And Yellow Top describe the type of battery and usage. Two yellow tops in parallel is nice information, but what I am looking for is capacity or Ah (Optima usually puts this as C20 Capacity), for the starter or in this case Red Top we are looking for CCA. If you do not have that information then the model # would let us look this up.
The largest yellow top I can find is 75 Ah so you would have a bank of 150 Ah. In general we don't like to discharge more than 50% so that would mean you have about 75 Ah of usable battery power. (and that is based off the batteries being new )
Your Ac unit uses 115 * 15 or 1725 Watts at high, and 115 * 11 or 1265 watts at low.
Will it drain your battery bank, at high (1725 watts) / 12 volts = 143.75 amps. so this would mean you could get about 20 - 25 mins running off of an inverter. Note: these are rough calculations as they don't factor in Inverter efficiency , and other anomalies of running off of batteries. Even with the alternator running you would be running off of some battery power
At low power, the ac again would be using 1265 watts or 105 amps. This would increase the run time on the battery a small amout, this of course would leave you only 25 amps left for the van, again these are rough calculations. When you came to a stop at traffic lights and such the output of the alternator would be drastically less.
I would use a voltage controlled battery separator or ACR in this usage model. This would allow the battery system to disconnect during idle, and not drop the voltage of the overall system as may happen with a diode based isolator.
The "easystart" would be a good solution for the start up surge current, but it will not help in the overall running of the system.
A power inverter converts 12 DC power into 115 volt AC power. Your Whistler P1000AC 1000 Watt Continous/2000 Watt Peak is not capable of providing the power that you would need for the specified AC unit.
A power converter specifically the "WFCO WF-9875 75 Amp Power Converter" converts 115 volt AC into DC power, this model acts as a three stage charger.
They are two different pieces of equipment.
So in general for this task, I would recommend a larger alternator, a larger inverter , 2000 watt continuous
, and a larger battery bank would not hurt either.
hope this helps.