Recommended Lithium Compatible Replacement For A Parallax Power Supply 7155

Question

Question:

I have a Parallax Power Supply 7155 converter in my RV. I want to convert to a lithium battery system. Do you have a in converter that will handle lithium charging profile?

asked by: William G

0

Expert Reply:

Since there isn't a converter cross section replacement that's compatible with lithium for your Parallax Power Supply 7155 I recommend replacing it with the Progressive Dynamics Mighty Mini AC/DC Panel and Converter/Smart Charger - 60 Amp # PD4060K.

This power center has an LA/LI switch in the upper left-hand corner of the unit that will let you switch the charging profile from Lead Acid (LA) to Lithium (LI).

expert reply by: Kevin C

0

PD4060K LI-LA Switch
(click to enlarge)

Joshua

7/9/2026

I'm in a similar position, a failed converter in my RV's Parallax 7155 and looking to support future Lithium battery uppgrade. How does the size of the PD4060K compare to the 7155? Is it likely to mount in the same hole or take considerable modifications to fit?

Claire H.

7/9/2026

@Joshua The dimensions of the Parallax 7155 are 7" long x 14" wide x 11 3/4" tall, the lower converter section is 9.5" long x 7" deep x 4" tall. The Progressive Dynamics part # PD4060K is slightly smaller at 12 1/4" long and 8 3/4" wide and 7 1/4" deep. It requires a cutout that is 10 3/4" long x 7 1/4" tall to fit. Your current cut out for the Parallax should be similar in size so only minor modifications would be needed to make the Progressive Dynamics converter fit.

Joshua

7/9/2026

@ClaireH Thank you for the dimensions. Sounds like the PD6060K might have a smaller footprint than I want to use. I'd have to make a filler panel to locate it in the same place. I'll need to measure my rough cutout, but it looks like the PowerMax PM67VR, PowerMax PM98FR, or WFCO WF86FR might be closer matches in size. The idea of wireless lighting control on the PM68FR sounds interesting, though I don't have powered slides or awnings to use with the latching circuits.

Claire H.

7/9/2026

@Joshua I'm not as familiar with the PowerMax since they're relatively new to us, but WFCO has always been an excellent brand. It looks like the cutout dimensions are almost identical for the two and a better match to your current set up like you mentioned. The wireless aspect of the PowerMax unit is interesting, but if you don't have slides or awnings with latching circuits may not be worth the extra price if you aren't able to use that feature.

Answer 1

Hey Allen, the correct converter replacement for a WFCO WF-8955 is the Progressive Dynamics Replacement Section for AC/DC Power Distribution Panel item #PD4655V. This converter is lithium capable. This unit will fit in the same dimensions that your…

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Answer 2

Yes, you do need to move the jumper over from the lead acid to the lithium setup and you'd have the higher voltage charging profile.

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Answer 3

Hello Adam, thanks for reaching out. The Progressive Dynamics 4000 Series RV Converter #PD4060K can certainly be used in a smaller trailer like your Casita Liberty Deluxe. Then for a DC to DC charger that can be mounted on the trailer I recommend the…

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Answer 4

Based on my on the information available for your 2017 Airstream International Signature 27FB I was able to find that you have torsion axles, but while I believe your trailer uses Dexter axles I was not able to confirm this. You will want to check…

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Answer 5

Hey John, you'd need a new panel like the Progressive Dynamics Mighty Mini part #PD4045KA which is the most similar to your Parallax 7345 except is Lithium battery compatible. There isn't a lower section replacement available for what you…

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Answer 6

Yes, we have spoken with Progressive Dynamics in the past and the Lithium Converter for WFCO RV Power Centers #PD4655LIV does fit your Parallax 7155 Converter/Charger. The housing is the exact same so it will bolt right up. This a really great option…

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Answer 7

Hey Gordon, thanks for reaching out! Yes, the 55 Amp Progressive Dynamics Replacement Section for AC/DC Power Distribution Panel #PD4655V will replace your Parallax 7100 just fine. You won't need anything else to complete your upgrade!

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Answer 8

The Replacement Converter #PD4655V is the correct converter for your Parallax 7355 power center. I do not see that WFCO shows their 8955PEC being acceptable to use with your Parallax 7355.

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Answer 9

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 10

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 11

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 12

Thanks for the picture! I checked with Progressive Dynamics the replacement power converter you need for your Parallax Series 7300 Model 7345 is the Replacement Converter for Parallax/Magnetek or WFCO RV Power Centers - 45 Amp item #PD4645V.

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Recommended Lithium Compatible Replacement For A Parallax Power Supply 7155

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