Progressive Dynamics 9145 (with Charge Wizard) + Mighty Max 12V 200Ah 4D SLA AGM Battery = ?Good combination?

Review of the battery here, with more spec info and analysis for RV use etc.https://www.deepcyclemarinebattery.com/reviews/mighty-max-ml4d-12v-200ah-4d-sla-agm-battery.htmlThe 45 amp charger is rated above the AGM 20% "rule" for bulk stage. Usually in RVs you won't see that 45 at the battery but might get 40 or so. You would need to use the CW to keep it at 14.4 for the whole time until the battery gets down to 1 amp (signal it is full) before dropping to 13.6. And you will need an ammeter to know when it is down to that 1 amp. (I use my Trimetric for that with my AGMs)The 14.4v of the PD is at the low end of the charging voltage range in the spec, which is at 77F. Any cooler out than 77F makes the 14.4 too low, but also that temp is related to battery temp while being charged, so it should be ok down to some lesser ambient.So it could be ok as a combo. The one 200AH is not well suited for high amp short time inverter work (as with a MW or toaster), as mentioned in that linked review above.

I would have Lifeline or lithium but the combo will be fine.Careful lifting an 8D.

BFL13 wrote:Review of the battery here, with more spec info and analysis for RV use etc.https://www.deepcyclemarinebattery.com/reviews/mighty-max-ml4d-12v-200ah-4d-sla-agm-battery.htmlThe 45 amp charger is rated above the AGM 20% "rule" for bulk stage. Usually in RVs you won't see that 45 at the battery but might get 40 or so. You would need to use the CW to keep it at 14.4 for the whole time until the battery gets down to 1 amp (signal it is full) before dropping to 13.6. And you will need an ammeter to know when it is down to that 1 amp. (I use my Trimetric for that with my AGMs)The 14.4v of the PD is at the low end of the charging voltage range in the spec, which is at 77F. Any cooler out than 77F makes the 14.4 too low, but also that temp is related to battery temp while being charged, so it should be ok down to some lesser ambient.So it could be ok as a combo. The one 200AH is not well suited for high amp short time inverter work (as with a MW or toaster), as mentioned in that linked review above.Thanks for the in depth reponse. Everyone who asks a question is hoping for a particular answer and I was hoping that I could pair the two and forget them, out of sight and out of mind. Sounds like I'll have to find my Trimeteric and return it to service. The suitability of the battery vis a vis the inverter isn't an issue as I've never utilized an inverter. FYI to the forum, 90% of the time my RV will be sitting on the pad and connected to shore power and in 20 years of RVing I've probably only boondocked 10 times and all those were just overnight.

time2roll wrote:I would have Lifeline or lithium but the combo will be fine.Careful lifting an 8D.Thanks!

The review notes that big battery is good for 10 years on standby, as opposed to cycle use, so it should be fine for extended time at 13.6 on FHU. You must have a reason to want a 200AH battery instead of a 100AH one while on FHU, but that wasn't the question.

This charger/converter + this battery = ? | Good Sam Community

33 Replies

lenr
Explorer III
Sep 24, 2019
I'm going to start a new thread instead of further hijacking. Thanks for the replies.
BFL13
Explorer II
Sep 24, 2019
lenr wrote:
Help my education: why is it especially important for AGMs to be charged at 14.4? 4 hours at 14.4 was mentioned above, but my Trojan T-105 AGM manual says to limit 14.4 absorption voltage to 2 hours. It does say to use a constant absorption voltage of 14.4.
Thanks.

First they say to keep it at 14.4 until amps taper to 0.5a /100AH of battery capacity. Then they say to limit the 14.4 to two hours? How do they know how long it will take to get to 0.5a ???

Also, the T-105 AGM is still a 6v batt, so it takes two to make 12v and that is about 220AH or whatever the AGM version is instead of the Wet's 225. (I forget the AGM number) so it will take a while to get to 1.0a for the 220ish AH. More than two hours!!!

IMO forget that, and go for the proper 0.5a/100AH and never mind how long it takes.
pianotuna
Nomad III
Sep 24, 2019
lenr,

You should follow the maker's recommendations "to the letter".

Not all companies are specific--so 14.4 is a "safe" number for most.
lenr
Explorer III
Sep 24, 2019
Help my education: why is it especially important for AGMs to be charged at 14.4? 4 hours at 14.4 was mentioned above, but my Trojan T-105 AGM manual says to limit 14.4 absorption voltage to 2 hours. It does say to use a constant absorption voltage of 14.4.
Thanks.
MEXICOWANDERER
Explorer
Sep 19, 2019
Yep and how about power post and home recovery ability? Most garbage can't acheive it connected for 1,000 hours
RKW
Explorer II
Sep 19, 2019
red31 wrote:
Wow, 4 hrs at the push of a button. Longer than generator time, nothing new!

I think the important thing, especially for AGM batteries, is the ability to prompt the charger to a 14.4 volt output.
red31
Explorer
Sep 19, 2019
Wow, 4 hrs at the push of a button. Longer than generator time, nothing new!
MEXICOWANDERER
Explorer
Sep 19, 2019
Well said LY318
landyacht318
Explorer
Sep 19, 2019
Ive installed more than one pd9245 delivered here in california with the wizard. The measured voltages at output were slightly above specs. And pushbutton 4 more hours of 14.56v is a great feature, however no doubt some will stomp their feet at the temerity of a product forcing them to do anything.
RKW
Explorer II
Sep 19, 2019
Charge Wizard