Aftermarket Inverter Size on 2017 Dual Batteries and HD Alternator - Ford Transit USA Forum
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post #1 of 11 (permalink) Old 07-31-2016, 07:27:PM Thread Starter
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Aftermarket Inverter Size on 2017 Dual Batteries and HD Alternator

My husband and I are in the process of ordering a 2017 Transit van that will be used largely for travelling with our 6 dogs. We are getting the heavy duty alternator and dual batteries and are wondering what size inverter the factory installed dual batteries would be capable of supporting. Is a 2000w inverter unrealistic?..what about 1000w? We're not looking have that high of a load on with the engine off...just want to know what its capable of and there's very little information on the batteries and alternator that I can find! Thanks!
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post #2 of 11 (permalink) Old 07-31-2016, 08:08:PM
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Sorry I don't know the source but I heard it is 500 watts. I ordered it just to have the factory outlet. I plan to replace the factory inverter with a more powerful unit.

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post #3 of 11 (permalink) Old 07-31-2016, 08:30:PM Thread Starter
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I know the factory installed inverter is only 150 watts and is modified sine wave, so that's why I'm looking at other options and would like to have the have the ability to use as much power as possible.
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post #4 of 11 (permalink) Old 07-31-2016, 08:51:PM
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If you get power for your inverter from the 3 power points on the driver pedestal, you have a max of 180A. At 12V, that means the fuses won't blow with a ~2100W load (12*180=2160).
That's the maximum possible input wattage to the inverter
HOWEVER, the inverter is never 100% efficient.
I'd say you should limit your inverter to about 1000W max output.

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post #5 of 11 (permalink) Old 07-31-2016, 09:09:PM
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my magnum energy 2012 2000 watt pure sine wave inverter pulls 265 amps max at 12 volts dc, if this helps? (hooked to house batteries not truck battery)
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post #6 of 11 (permalink) Old 07-31-2016, 09:31:PM Thread Starter
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Ok, so a 2000 watt inverter is going to be too much....but 1000w *should* work. Thank you!
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post #7 of 11 (permalink) Old 08-01-2016, 11:23:AM
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I have one CCP on the outside of the driver's seat ('16 t150). As far as I can tell it is always hot 12 volts.
Can I use that stud and a good ground to hook up the ring terminals for a Battery Tender to be used when parked to charge the vehicles single battery? There Will be times when it will stay parked for months.( with a full tank of gas and sta-Bil )
I don't want to get jammed up with these newfangled electronics and CAN-BUS.
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post #8 of 11 (permalink) Old 08-01-2016, 01:01:PM
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Originally Posted by Stina View Post
Ok, so a 2000 watt inverter is going to be too much....but 1000w *should* work. Thank you!
I will use a 1000 watt pure sine inverter powered by the three 60 amp CCP's. First a 4 post terminal block (3 CCP's and one output), a 150 amp type T fuse and a battery disconnect switch are installed between the CCP's and the inverter positive post.

The Transit has a approx. 1000 watt electric air heater to warm the cab before the engine water is warm enough to provide heat. The heater is actuated by turning the temperature dial fully clockwise. The air heater and the inverter should not be used at the same time. Also the load on the inverter should not be higher than 1000 watts. Every inverter has surge capacity higher than its rating that can be used for short durations. Do not use the surge capacity.

Do not know how much power the Transit alternator provides at idle. If you fully load the inverter with engine idling you may be depleting the charge in the starting batteries until engine rpm increases.

My 1000 watt inverter is installed but not yet wired. I had a 600 watt inverter in the sold Sprinter that worked very well.

2015 high roof 148" WB 3.5 Ecoboost 3.31 LS rear cargo.

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post #9 of 11 (permalink) Old 08-01-2016, 04:40:PM
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Edited: The BEMM (4.3.6 Electrical/Charging System/Vehicle Electrical Capacity - Alternator) has the RPM vs Amps curves for each engine/alternator. Divide the alternator RPM by 2.7:1 for engine RPM (gas engines). Short answer, ~1/3 of rated Amps at idle and about 85% of capacity at around 1500 RPM depending on temperature. The ratio for diesel is not stated in the BEMM but the story should be about the same. Please also note that the alternator current can vary quite a bit with temperature (more when cold) and so do not assume you get 270 Amps (or 150) as whenever you have the engine running.

Thanks to Orton below for the clarification.

Last edited by stevek; 08-01-2016 at 05:47:PM.
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post #10 of 11 (permalink) Old 08-01-2016, 05:11:PM
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The graphs are for the alternator rpm. Divide the graph speeds by 2.7 to get the engine rpm. So at 1500 alternator rpm (556 engine rpm) the graph says you have 90 amps of output on the HD gas engine alternator.

Got the 2.7 ratio from the note on page 79 of the 2015 BEMM.

My EB idles at 950 for a short period of time and then idle slows to about 620 rpm.

So at idle the alternator has about 90 amps minus what the vehicle is using.

Out of curiosity I wondered if the idle would increase if I turned on the electric air heater. It did not.

So use of a 85% efficient 1000 watt inverter at full capacity (not surge) at idle would use about 83 amps. 1000/.85 = 1176 watts/14.1 volts = 83 amps. Suspect some of the amperage would be supplied by the batteries at idle. I would not use the inverter for long periods of time with the engine idling.

If this explanation is incorrect, please post the correction.

2015 high roof 148" WB 3.5 Ecoboost 3.31 LS rear cargo.

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Last edited by orton; 08-01-2016 at 05:17:PM.
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