|
|
04-02-2013, 10:08
|
#1
|
Registered User
Join Date: Jul 2008
Location: Rockport, Texas
Boat: Tartan 41 #68
Posts: 304
|
Battery Draw
I have 4 Gel Cell 6v 180ah batteries making up a 360ah 12v house bank. I have a 2000w inverter I use to power 120v ac appliances. If I pull 70-80 amps from the microwave or toaster for 2-3 minutes straight will this damage the batteries in anyway?
|
|
|
04-02-2013, 11:01
|
#2
|
Registered User
Join Date: Dec 2010
Location: Western Caribbean
Boat: 38/41 Fountains pajot
Posts: 3,060
|
Have u actually stopped tried and seen it pulls 70-80amps??that sounds awfully high
|
|
|
04-02-2013, 11:04
|
#3
|
S/V rubber ducky
Join Date: Jul 2007
Location: heading "south"
Boat: Hunter 410
Posts: 20,362
|
Re: Battery Draw
Quote:
Originally Posted by bob_77903
I have 4 Gel Cell 6v 180ah batteries making up a 360ah 12v house bank. I have a 2000w inverter I use to power 120v ac appliances. If I pull 70-80 amps from the microwave or toaster for 2-3 minutes straight will this damage the batteries in anyway?
|
it's OK, that is what it is all for
__________________
Don't ask a bunch of unknown forum people if it is OK to do something on YOUR boat. It is your boat, do what you want!
|
|
|
04-02-2013, 11:06
|
#4
|
Marine Service Provider
Join Date: Jan 2007
Location: Maine
Boat: CS-36T - Cupecoy
Posts: 3,197
|
Re: Battery Draw
Quote:
Originally Posted by bob_77903
I have 4 Gel Cell 6v 180ah batteries making up a 360ah 12v house bank. I have a 2000w inverter I use to power 120v ac appliances. If I pull 70-80 amps from the microwave or toaster for 2-3 minutes straight will this damage the batteries in anyway?
|
For short durations the GEL's should have no trouble with that at all.
|
|
|
04-02-2013, 11:36
|
#5
|
Registered User
Join Date: May 2011
Location: Lake Ont
Posts: 8,547
|
Re: Battery Draw
A microwave I understand... but wouldn't it be much more efficient energy-wise to toast bread over a butane/alcohol/propane stove burner... or just have cereal?
|
|
|
04-02-2013, 12:03
|
#6
|
Moderator Emeritus
Join Date: Sep 2006
Posts: 4,663
|
Re: Battery Draw
I've got a small microwave, and a 2kW inverter. This draws approximately 90A from my 1000Ah 12V battery bank. Most of the time I use the propane oven or stovetop, but occasionally the microwave comes in handy. Running it for 6 minutes consumes 9Ah -- not too bad, really. The effective battery capacity will be less at this high rate, I would guess perhaps 10 or 15% worse.
Your 360Ah bank should support occasional microwave use.
__________________
Paul Elliott, S/V VALIS - Pacific Seacraft 44 #16 - Friday Harbor, WA
www.sailvalis.com
|
|
|
04-02-2013, 13:09
|
#7
|
Registered User
Join Date: Jul 2008
Location: Rockport, Texas
Boat: Tartan 41 #68
Posts: 304
|
Re: Battery Draw
I appreciate all of your response..
|
|
|
04-02-2013, 22:07
|
#8
|
Registered User
Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 8,462
|
Re: Battery Draw
3 minutes at 80 amps = 4 Ah.
|
|
|
05-02-2013, 03:33
|
#9
|
Registered User
Join Date: Jul 2008
Location: Rockport, Texas
Boat: Tartan 41 #68
Posts: 304
|
Re: Battery Draw
I wasn't so concerned with the 3-4AH depletion, as the 70-80 amp draw for 2-3 minutes.
|
|
|
05-02-2013, 05:01
|
#10
|
Registered User
Join Date: Jan 2006
Location: FL
Posts: 645
|
Re: Battery Draw
Quote:
Originally Posted by bob_77903
I wasn't so concerned with the 3-4AH depletion, as the 70-80 amp draw for 2-3 minutes.
|
The only issue would be if the inverter were installed with undersized wiring, I believe you need something like 3/0.
|
|
|
05-02-2013, 05:39
|
#11
|
Registered User
Join Date: Dec 2010
Location: Western Caribbean
Boat: 38/41 Fountains pajot
Posts: 3,060
|
Re: Battery Draw
Quote:
Originally Posted by Fishspearit
The only issue would be if the inverter were installed with undersized wiring, I believe you need something like 3/0.
|
Why 3/0?thats huge,, wouldnt 2/0 or something close be good or is there a guide for this? Amps vs run vs wire size?
|
|
|
05-02-2013, 06:27
|
#12
|
Registered User
Join Date: Jan 2006
Location: FL
Posts: 645
|
Re: Battery Draw
Quote:
Originally Posted by Dulcesuenos
Why 3/0?thats huge,, wouldnt 2/0 or something close be good or is there a guide for this? Amps vs run vs wire size?
|
I used one of the online wire size calculators to come up with the 3/0.
|
|
|
05-02-2013, 07:31
|
#13
|
Registered User
Join Date: Jul 2008
Location: Rockport, Texas
Boat: Tartan 41 #68
Posts: 304
|
Re: Battery Draw
I'm using 4/0 for the inverter now. I never use it to max output. Most I've seen on the LED readout is about 800W FWIW....
|
|
|
05-02-2013, 19:37
|
#14
|
Registered User
Join Date: Sep 2008
Location: San Diego & Port Townsend
Boat: Formosa 51 Ketch
Posts: 144
|
80 amps, 10 ft, number 3 wire gives 2.5% voltage drop
__________________
Bob Mathews
S/V Pegasus
|
|
|
05-02-2013, 20:14
|
#15
|
Eternal Member
Join Date: Jul 2006
Posts: 4,046
|
Re: Battery Draw
Wiring and fusing for the inverter should be sufficient to support the total capacity of the inverter. A 2000 watt inverter can draw upwards of 180-200A at full capacity.
Wiring should therefore be as short as possible. For runs up to 10 feet or so, I'd use a minimum of AWG 2/0 and a Class-T or ANL fuse located near the batteries.
Bill
|
|
|
|
|
Thread Tools |
Search this Thread |
|
|
Display Modes |
Rate This Thread |
Linear Mode
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
Advertise Here
Recent Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
Vendor Spotlight |
|
|
|