Submitted: Tuesday, Feb 08, 2005 at 14:31
ThreadID: 20238 Views:2478 Replies:1 FollowUps:4
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Hi can any one tell me how long a 640cca deap cycle battery would last running a
600w (1500 surge) power tech inverter (modified sine wave) running a couple of
fluros or a 60w globe.Or should they only be used with the engine running?
I have two 80w solar panels charging the battery but of course only during the day.
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Reply By: David Au - Tuesday, Feb 08, 2005 at 14:40

Tuesday, Feb 08, 2005 at 14:40
A 640cca battery is highly unlikely to be a deep cycle battery. 'CCA' is Cold Cranking Amps' and a deep cycle battery would not be rated with a CCA rating.

Have you had the fluoros running on the modified sine wave inverter???
I doubt you have!

For every 10w on 240v you use, it will be 1.x (between 1.1 and 1.4 amps dependent on efficiency), so for every 100w you will be using approximately 11.0 amps.
Why use a 60w globe when you could use a 16w 12v fluoro which would give out the equivalent light of a 75w bulb.
AnswerID: 97248

Follow Up By: crfan - Tuesday, Feb 08, 2005 at 14:49

Tuesday, Feb 08, 2005 at 14:49
The Battery is a AC Delco RV/MARINE deep cycle/cont use 83 amp hrs
138 reserve cap( thats all on the battery)I am just interested what sort of time a battery will last using different type of 240 v things
ie:does it crank out 600w all the time or adjust to the load applied
I havent fitted it yet .
FollowupID: 355857

Follow Up By: joc45 - Tuesday, Feb 08, 2005 at 15:06

Tuesday, Feb 08, 2005 at 15:06
I agree with David; buy some 12v CFL lights, which have very high conversion efficiency and the tube itself puts out about 6 times the output of an equivalent incandescent lamp. I'm currently running several and the consumption ranges from 0.6A to 1.0A for heaps of light. Many sources of these from 12v versions of the lamp, to tube/inverter models built into a plastic housing.
Cheers, Gerry
FollowupID: 355865

Follow Up By: David Au - Tuesday, Feb 08, 2005 at 15:17

Tuesday, Feb 08, 2005 at 15:17
CRFan the inverter will only take the amount of power it needs. If you are using 150w on 240v your inverter will take between 16.0 and 17.0 amps. If you use less power the inverter will take less amperage.

Many things will not run properly, fail to run completely or get excessively hot running from a modified sine wave inverter, so check out carefully that your gear will run from the inverter.

Try not to discharge the battery below 12.0v (30 minutes after use) otherwise you will destroy your battery quickly.
FollowupID: 355872

Follow Up By: Member - Jeff M (WA) - Tuesday, Feb 08, 2005 at 16:14

Tuesday, Feb 08, 2005 at 16:14
I'm pretty sure the battery you are using is a deep cycle, but a calcium-calcium type. We use them for solar powered cameras and they do ok. Fluros of an inverter are no good at less the inverter is Pure Sinewave. Modified Sinwave will cause havock with 240v fluros and become really ineffeciant.

If you are using an inverter for more than about 150-200w you really should think about starting your motor because your going to drain the batt's pretty quickly at that rate.
FollowupID: 355879

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