Can I brew a pot of coffee

[Aceallenk]

Do I have enough battery to brew a pot of coffee? The coffee machine is typical, 1500Walt and takes maximum 15 minutes to brew a pot . lets say 400walts total. I have 3x200A lead acid batteries (so say 300 available Amp using half the charge), my system is a Pure Sine wave power inverter 3000Watt DC12V to AC120. Solar is 400W of solar panels with a 40A Renogy Rover MPPT controller. So the question is, do these 3 lead acid batteries have enough charge to brew a pot of coffee in the morn while boondocking. I forgot how to do the math to know what is needed.

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[Rednecktek]

To get the exact amount throw a Kill-A-Watt on the coffee maker and brew a pot. You should be fine, that system sounds like it should have plenty of juice for bean juice.

 

[SparkyJJO]

I would suspect your coffee pot is rated to use 1500W peak, but it isn't 1500W non-stop. I agree, use a kill-a-watt and find out.

Heck, maybe I'll stick my coffee pot (el cheapo $18 Mr. Coffee) on a kill a watt if I remember tomorrow morning and let you know what it does for reference. It is old and slow so it takes closer to 20-25 min to brew 32 ounces.

 

[sunshine_eggo]

Do I have enough battery to brew a pot of coffee? The coffee machine is typical, 1500Walt and takes maximum 15 minutes to brew a pot . lets say 400walts total. I have 3x200A lead acid batteries (so say 300 available Amp using half the charge), my system is a Pure Sine wave power inverter 3000Watt DC12V to AC120. Solar is 400W of solar panels with a 40A Renogy Rover MPPT controller. So the question is, do these 3 lead acid batteries have enough charge to brew a pot of coffee in the morn while boondocking. I forgot how to do the math to know what is needed.

Ignoring potential wiring losses, but considering inverter inefficiency:

1500W/12V/.85 = 147A

147A * 0.25h = 36.8Ah, 12V capacity needed

3 * 200Ah = 600Ah total capacity

36.8Ah/600Ah = 6.1% of battery capacity to brew a pot.

This does not take into consideration Peukert effect, but I would not expect that to make a huge difference using a C4 current vs. the 200Ah rated C20 current. Maybe it would use as much as 9-10% of capacity.

 

[Mattb4]

I had no trouble running my Bunn coffee maker off my 3000w setup recently when there was a power outage. Basically no extra startup demand due to a coffee maker simply being a heater coil. 1500w/15min/60min/hr= 1500w*.25h= 375wh Your batteries are 600ah at 12v =7200w of which you only use 3600w. Thus running your coffee machine is not going to impact too much.

 

[time2roll]

Yes if fully charged, enjoy the coffee.

And if last night the battery was at 50% as you turned in and the furnace was running most of the night.... might be looking at low battery alarm or shut down.

 

[Aceallenk]

Thanks a ton to all that replied to this post. It appears brewing a pot "bean juice, lol" in the morning won't demand more than what's already there. I installed this system 3-4 years back, but never had a chance to really use it, had a seasonal a couple years afterwards, then covid thing happened etc and thinking this year we found a good spot fishing using the solar only, might even add another battery incase...

 

[Rednecktek]

"I have too much battery capacity on my system" - Nobody Ever.