PTC protected dual battery harness

Looking for something similar to the DMP 318. I took over an account with 35 DMP 500 panels and the customer needs to add additional battery backup. I don't have an account with DMP. Anything available over the counter?

Reply to
ibewman
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How much more "backup" does he need? Most panels can handle recharging up to a 14AH battery (2 7AH batteries in parallel will fit in most cans if they're not "overloaded" with wire).

Reply to
Frank Olson

With or without diodes? :^)

Reply to
Robert L Bass

I think I have some. Also, have some Radionics ones as well.

Reply to
Crash Gordon

The relationship that DMP has with Bosch (what used to be Radionics) means that whatever one has, the other is likely to have something very similar to it.

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Reply to
Roland Moore

Frank, when more than one battery is connected in parallel, the correct way to do it is to use some sort of overload protection in the battery leads. Either a circuit breaker, a PTC device, or even a properly selected fuse. Suppose one battery develops an internal short: the good battery will start trying to charge the shorted battery, and hazardous amounts of current can flow.

A comment on the original poster's question: I think it is monumentally stupid for someone to take over 35 DMP panels (DMP's biggest and most powerful panel, by the way) and not have a source for spare parts. If he can't even come up with a battery harness, what's he going to do when he needs a keypad or a loop expander, or when one of those XR500 panels craps out on Friday night?

Reply to
Nomen Nescio

ok, so put a bigger battery in there.

Reply to
Spudz

The 500 is awesome. I use the 100 for big residential and love it. I wouldn't take over any panel I couldn't support...especially at 3am on a Sunday night.

Reply to
Crash Gordon

Nomen, I also purchased several pieces of backup equipment. I have enough parts to put together another 5 systems.

Reply to
ibewman

I don't know whose batteries you've used, but "internal shorts" are extremely rare. DSC's 1864 has provision for connecting two batteries in parallel (12v7AH). There's no provision on the harness for an inline fuse or PTC device. Interesting.

Agreed. But then there's always Jim R's garage... :-)

Frank Olson

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"It only implies that I don't sit back and let you post more false accusations without responding." - Robert L. Bass

Reply to
Frank Olson

Reply to
Roland Moore

That'll be news to DSC

Reply to
Mark Leuck

News to DSC? I don't think so. It is right in their installation manual.

(From the old Power Series manual) Auxiliary Power Terminals - AUX+ and AUXThese terminals provide up to 550 mA of additional current at

12 VDC for devices requiring power. Connect the positive side of any device requiring power to the AUX+ terminal, the negative side to AUX- (ground). The AUX output is protected. This means that if too much current is drawn from these terminals (such as a wiring short), the panel will temporarily shut off the output until the problem is corrected.

(From the new Power Series manual) The control panel can provide a maximum of 700mA of current for modules, powered detectors, relays, LED's etc.

Reply to
Just Looking

I think you made reference to "1 Amp", which is what Mark picked up on and responded to. You gotta be precise in this NG or people will jump all over you.

Reply to
Frank Olson

Last I checked 550mA and 700mA wasn't 1A

Reply to
Mark Leuck

I think I said barely an AMP. As in less than an amp. The 700ma is the threshold in the manual for having to add a booster. When you meter it with a load it can get up to nearly an AMP of output before factory smoke becomes a concern. I wouldn't recommend doing it. In fact I would recommend any DSC panel if there is a substantial load present.

Reply to
Roland Moore

That sounds like a Bass response and it sounds like you have no problems with grossly overloading panels

Reply to
Mark Leuck

  1. "barely an AMP" = 1 AMP

  1. Poor planning does not excuse overloading a panel

Reply to
Mark Leuck

I don't think anyone purposely sets out to overload a panel. I think an installation occurs and at that time load factors are considered and calculated. Then as things change and more power consuming devices are added over time, then the problem is created. Everyone thinks adding just one more keypad, wireless receiver or detector couldn't involve having to add another power supply. Most times no one bothers to recheck the power load. That's when you see what happens to the panel when the load approaches "barely an AMP".

Reply to
Roland Moore

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